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Update an Oracle WebLogic Installation from 7.4 to 7.5

The following steps describe how to update the Camunda artifacts on an Oracle WebLogic application server in a shared process engine setting. For the entire procedure, refer to the update guide. If not already done, make sure to download the Camunda BPM 7.5 Oracle WebLogic distribution.

The update procedure takes the following steps:

Uninstall the Camunda Applications and Archives

Replace Camunda Core Libraries

Replace Optional Camunda Dependencies

Maintain the BPM Platform Configuration

Maintain Process Applications

Install the Camunda Archive

Install the Web Applications

In each of the following steps, the identifiers $*_VERSION refer to the current version and the new versions of the artifacts.

1. Uninstall the Camunda Applications and Archives

First, uninstall the Camunda web applications, namely the Camunda REST API (artifact name like camunda-engine-rest) and the Camunda applications Cockpit, Tasklist and Admin (artifact name like camunda-webapp).

Uninstall the Camunda EAR. Its name should be camunda-oracle-weblogic-ear-$PLATFORM_VERSION.ear.

2. Replace Camunda Core Libraries

After shutting down the server, replace the following libraries in $WLS_DOMAIN_HOME/lib with their equivalents from $WLS_DISTRIBUTION/modules/lib:

camunda-engine-$PLATFORM_VERSION.jar

camunda-bpmn-model-$PLATFORM_VERSION.jar

camunda-cmmn-model-$PLATFORM_VERSION.jar

camunda-dmn-model-$PLATFORM_VERSION.jar

camunda-xml-model-$PLATFORM_VERSION.jar

camunda-engine-dmn-$PLATFORM_VERSION.jar

camunda-engine-feel-api-$PLATFORM_VERSION.jar

camunda-engine-feel-juel-$PLATFORM_VERSION.jar

camunda-commons-logging-$COMMONS_VERSION.jar

camunda-commons-typed-values-$COMMONS_VERSION.jar

camunda-commons-utils-$COMMONS_VERSION.jar

3. Replace Optional Camunda Dependencies

In addition to the core libraries, there may be optional artifacts in $WLS_DOMAIN_HOME/lib for LDAP integration, Camunda Spin, and Groovy scripting. If you use any of these extensions, the following update steps apply:

LDAP integration

Copy the following library from $WLS_DISTRIBUTION/modules/lib to the folder $WLS_DOMAIN_HOME/lib, if present:

camunda-identity-ldap-$PLATFORM_VERSION.jar

Camunda Connect

Copy the following library from $WLS_DISTRIBUTION/modules/lib to the folder $WLS_DOMAIN_HOME/lib, if present:

camunda-connect-core-$CONNECT_VERSION.jar

Camunda Spin

Copy the following library from $WLS_DISTRIBUTION/modules/lib to the folder $WLS_DOMAIN_HOME/lib, if present:

camunda-spin-core-$SPIN_VERSION.jar

Groovy Scripting

Copy the following library from $WLS_DISTRIBUTION/modules/lib to the folder $WLS_DOMAIN_HOME/lib, if present:

groovy-all-$GROOVY_VERSION.jar

4. Maintain the BPM Platform Configuration

If you have previously replaced the default BPM platform configuration by a custom configuration following any of the ways outlined in the deployment descriptor reference, it may be necessary to restore this configuration. This can be done by repeating the configuration replacement steps for the updated platform.

5. Maintain Process Applications

This section describes changes in the internal API of the engine. If you have implemented one of the APIs and replaced the default implementation then you have to adjust your custom implementation. Otherwise, you can skip this section.

Incident Handler

The interface of an Incident Handler has changed. Instead of a long parameter list, the methods pass a context object which bundles all required information, like process definition id, execution id and tenant id. Since the existing methods have been overridden, custom implementations of an incident handler have to be adjusted.

Correlation Handler

A new method has been added to the interface of a Correlation Handler
. The new method correlateStartMessage() allows to explicitly trigger a message start event of a process definition. If the default implementation is replaced by a custom one then it has to be adjusted.

Job Handler

The interface of a Job Handler
has changed to support multi-tenancy and separate the parsing of the configuration.